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NXP Semiconductors BC337,112
- Part No.:
- BC337,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
BC337,112.pdf
- Description:
- TRANS NPN 45V 0.5A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,889
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Product details
Overview
BC337,112 from Nexperia is a through-hole NPN general-purpose bipolar junction transistor (BJT) in SOT54 (TO-92) package, rated for 45 V VCEO, 500 mA IC, and 625 mW Ptot at Tamb ≤ 25 °C, commonly used in low-voltage DC switching and linear amplification circuits such as LED drivers and signal buffering in industrial control modules.
For engineers reviewing the BC337,112 datasheet, BC337,112 pinout, BC337,112 application, or BC337,112 equivalent, this page delivers verified electrical parameters, terminal mapping, thermal behavior, real-world use cases, and validated alternative parts - all specific to the BC337,112 variant with SOT54 packaging and C337 marking code.
Technical Context
The BC337,112 operates as a standard NPN BJT with base-controlled current amplification, supporting DC and low-frequency AC operation up to fT = 100 MHz. Its hFE range of 100–600 at IC = 100 mA / VCE = 1 V enables reliable gain selection across bias points.
It features VCEO = 45 V, VCBO = 50 V, and VEBO = 5 V, making it suitable for 24 V and lower rail applications. With Rth(j-a) = 200 K/W and Tj max = 150 °C, it sustains continuous operation under moderate power dissipation without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum collector-emitter voltage before breakdown; supports 24 V systems with safety margin. |
| IC (DC) | 500 mA - Continuous collector current rating; sufficient for driving relays, small solenoids, or LED arrays. |
| Ptot | 625 mW at Tamb ≤ 25 °C - Power handling capability on FR4 PCB; requires derating above ambient temperature. |
| hFE | 100–600 at IC = 100 mA, VCE = 1 V - Wide DC current gain range allows flexible bias design and tolerance to process variation. |
| VCE(sat) | ≤ 700 mV at IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes conduction loss in switching applications. |
| fT | 100 MHz - Transition frequency confirms usability in audio and low-speed digital signal amplification. |
| Rth(j-a) | 200 K/W - Junction-to-ambient thermal resistance; enables ~3.1 °C/mW self-heating rise under full load on standard PCB. |
Pinout & Package
BC337,112 uses the SOT54 (TO-92) plastic single-ended leaded through-hole package per JEITA SC-43A, with 2.54 mm lead pitch and standard 3-pin vertical orientation. It is compatible with manual soldering and wave soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current exit node; connected to ground or low-side return path in common-emitter configurations. |
| 2 | Base | Control input; requires current-limited drive (e.g., via series resistor) to achieve desired IC amplification. |
| 3 | Collector | Current entry node; typically tied to load and supply rail in low-side switch topologies. |
Key Features
| Feature | Design Value |
|---|---|
| High DC current gain | hFE = 100–600 ensures stable amplification across production lots and temperature ranges. |
| Low VCE(sat) | ≤ 700 mV at full 500 mA load reduces power loss and heat generation in saturated switching mode. |
| Robust voltage ratings | VCEO = 45 V and VCBO = 50 V provide margin for transient spikes in 24 V industrial environments. |
| Through-hole reliability | SOT54 package offers mechanical stability and thermal mass advantageous for prototyping and high-reliability assemblies. |
| Wide operating temperature | −65 °C to +150 °C junction range supports deployment in automotive engine bays and outdoor industrial enclosures. |
Applications
| LED Driver Circuit | Microcontroller GPIO Expander |
|---|---|
|
Use Scenario: Driving 20–100 mA indicator LEDs from 3.3 V or 5 V logic outputs. IC Role / Device Role / Timing Role: NPN switch configured in common-emitter mode, sinking current from LED anode to ground. Use Value: VCE(sat) ≤ 700 mV ensures minimal voltage drop, preserving forward voltage margin for red/green/blue LEDs. |
Use Scenario: Amplifying weak sensor signals or enabling higher-current peripherals from MCU I/O pins. IC Role / Device Role / Timing Role: Linear amplifier or emitter-follower buffer to isolate sensitive analog inputs from load variations. Use Value: hFE ≥ 100 provides predictable current gain, enabling accurate signal scaling without op-amp complexity. |
| Relay Control Interface | Audio Signal Pre-amplifier |
|
Use Scenario: Switching 12 V/24 V electromagnetic relays in PLC I/O modules and HVAC controllers. IC Role / Device Role / Timing Role: Low-side switch controlling relay coil current; base driven by optocoupler or logic gate. Use Value: IC = 500 mA and VCEO = 45 V safely accommodate typical 12–24 V relay coils with flyback protection. |
Use Scenario: Boosting microphone-level signals (mV range) to line-level (≈1 V) for ADC input stages. IC Role / Device Role / Timing Role: Common-emitter amplifier stage with fixed bias network and emitter degeneration. Use Value: fT = 100 MHz and low noise characteristics support clean amplification up to 20 kHz audio bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC337-25,112 | hFE = 160–400 (narrower, mid-range gain bin); otherwise identical ratings and pinout. | Better suited for designs requiring tighter hFE consistency across units, e.g., analog current mirrors. | Select BC337-25,112 when gain predictability matters more than maximum hFE spread. |
| BC337-40,112 | hFE = 250–600 (higher minimum gain); same package, voltage, and current ratings. | Preferred for low-base-drive applications where higher β reduces required base current and driver loading. | Choose BC337-40,112 when minimizing base drive current is critical, such as in battery-powered sensor nodes. |
Compared with BC337-25,112 and BC337-40,112, the BC337,112 offers the broadest hFE range (100–600), giving designers flexibility to select operating point across gain extremes without changing layout or bill of materials.
Availability
BC337,112 is available at Aetrix Electronics and suitable for industrial control interfaces, LED lighting subsystems, and embedded relay drivers requiring stable component supply and long-term manufacturability.
Supply support for BC337,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a global leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division, with focus on automotive, industrial, computing, and consumer markets.
The BC337,112 belongs to Nexperia's legacy general-purpose BJT family designed for cost-sensitive, high-volume applications demanding robustness, wide gain distribution, and proven reliability in through-hole assembly.
FAQ
What is the package type and pin configuration of BC337,112?
The BC337,112 uses the SOT54 (TO-92) through-hole package with standardized pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This matches JEITA SC-43A and is mechanically and electrically identical to legacy Philips/NXP TO-92 variants. The BC337,112 marking code "C337" appears on the device body.
What is the DC current gain (hFE) range for BC337,112?
The BC337,112 has a guaranteed hFE range of 100 to 600 when measured at IC = 100 mA and VCE = 1 V. This wide spread reflects its unsorted gain bin - unlike BC337-16, -25, or -40 variants, BC337,112 is not binned by hFE, offering maximum design flexibility at the cost of gain predictability.
Can BC337,112 replace BC337-25,112 in an existing design?
Yes, BC337,112 can replace BC337-25,112 physically and electrically - same SOT54 package, pinout, voltage/current ratings, and thermal specs. However, because BC337,112 includes lower-gain units (down to hFE = 100), verify circuit functionality across the full hFE range, especially in bias-sensitive analog stages.
What is the maximum power dissipation of BC337,112 at room temperature?
The BC337,112 has a total power dissipation rating of 625 mW at ambient temperature ≤ 25 °C when mounted on a standard FR4 PCB with single-sided copper. Derating is required above 25 °C - approximately 5.0 mW/°C reduction beyond that point, based on its Rth(j-a) = 200 K/W specification.
Is BC337,112 suitable for switching 24 V inductive loads?
Yes, BC337,112 is suitable for switching 24 V inductive loads such as relays or solenoids, provided external flyback protection (e.g., freewheeling diode) is used. Its VCEO = 45 V and IC = 500 mA ratings comfortably cover typical 24 V coil currents (< 200 mA), and VCE(sat) ≤ 700 mV limits resistive losses during conduction.
BC337,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 100mA, 1V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
BC337,112 FAQ
1.How can I place an order for BC337,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC337,112 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BC337,112 reliable?
The price and inventory of BC337,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC337,112 is usually 5 days.
3.What payment methods are accepted for BC337,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC337,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC337,112?
BC337,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC337,112 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BC337,112?
For technical support, including BC337,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC337,112 requirements.
6.How does Aetrix verify that BC337,112 is sourced from the original manufacturer or authorized distributors?
All BC337,112 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BC337,112 meets industry standards.
7.What is the process for return or replacement of BC337,112?
All BC337,112 units undergo pre-shipment inspection (PSI). If there is an issue with BC337,112, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BC337,112 part is unused and in its original packaging.
Return procedure for BC337,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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